EN
Let 𝕋 = [0,1) be the additive group of real numbers modulo 1, α ∈ 𝕋 be an irrational number and t ∈ 𝕋. We study ergodicity of skew product extensions T : 𝕋 × ℤ² → 𝕋 × ℤ², $T(x,s₁,s₂) = (x + α, s₁ + 2χ_{[0,1/2)}(x) - 1, s₂ + 2χ_{[0,1/2)}(x+t) - 1)$.